Pico TC08 USB THERMOELEMENT DATA LOGGER PP222 Manual Do Utilizador

 

// could terminate the application here

 }

//

// Start using the open units

//

short usb_tc08_open_unit_async (void)

This routine begins enumerating USB TC-08 units in the background and provides a return
immediately, so the calling thread can continue executing other code.

Note: The driver is thread safe and will not allow access to a single unit from more than one application.
If, therefore,  usb_tc08_open_unit_async does not find a unit, check that other applications are
not using the same USB TC-08. This includes applications on other user accounts on the same
computer, where fast user switching is supported.

None

1

- The call was successful.

0

- No more units were found.

-1

- An error occurred, call 

 with a handle of 0 to obtain the error

code.

Example

The following code is a fragment of a C application which demonstrates how to open a single unit with
the asynchronous open unit functions:

//======================================================

// Opening a unit asynchronously

//======================================================

// Tell the driver to start enumerating the unit in the background

// (usb_tc08_open_unit_async returns immediately)

();

// handle any error conditions

if

 (result == -

1

)

 {

(

0

);

 printf(

"Unit failed to open\nThe error code is %d"

, error_code);

 

// could terminate the application here

 }

else

 

if

 (result == 

0

)

 {

 printf(

"No USB TC08 units found"

);